That’s what I fear the most....
You can certainly have a bonded pair successfully especially if you have the time to devote to working with them, the relationship, and the knowledge of basic training/respect and respond to their body language.
It's just something to keep in mind, if they even pair up at all. They may not pair up!
My 2 aren't a bonded pair for example so I'm still their person and all members of my family can comfortably care for or play/handle them but the birds can still enjoy and even benifit from same species company. It can be very good for them.
Being into outdoor free flight, having more than one can have even more advantages but that's an entirely different thread so don't want to detract from your post.
I guess the word of caution simply is, beyond the obvious time and money, to be prepared for whatever the birds end up choosing.
It's not too disimilar from you being the chosen one to your bird then them choosing a new person and you simply have to account for that/behave/interact/even sacrifice accordingly for the sake of their happiness...and at times your flesh.